Bring to the boil, cook 10 minutes, or until clear, skimming off any impurities. Reduce the heat to a low simmer, secure with a lid and cook for 2 hours.

Now add remaining salt, sugar, and fish sauce. Cook for a further 10 minutes, then take off the heat.

In another large pot, bring 2 quarts water to boil then blanch each portion of noodles for 10 seconds then drain. Place the noodles in a bowl, now add 4 pieces of pork ribs to each bowl then cover the noodles with pork broth.